Symptoms of a Bad Heater Core on a Semi-Truck A semi-truck's heater core is a crucial component of its HVAC system, responsible for regulating the cabin temperature and providing heat during cold weather. A malfunctioning heater core can impact the comfort and safety of the driver, as well as the overall performance of the truck. In this infographic, we discuss the symptoms of a bad heater core on a semi-truck and the necessary steps for addressing these issues. Source: https://www.truckac.com/product/heater-cores.html #heatercore #truckheater #truckhavc #automotive #infographic